/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.it;

import org.apache.iotdb.it.env.EnvFactory;
import org.apache.iotdb.it.framework.IoTDBTestRunner;
import org.apache.iotdb.itbase.category.ClusterIT;
import org.apache.iotdb.itbase.category.LocalStandaloneIT;
import org.apache.iotdb.itbase.category.RemoteIT;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import java.sql.*;
import java.util.*;

import static org.junit.Assert.*;

@RunWith(IoTDBTestRunner.class)
@Category({LocalStandaloneIT.class, ClusterIT.class, RemoteIT.class})
public class IoTDBInsertNullIT {
    private static final List<String> sqls = new ArrayList<>();
    private static Connection connection;

    @BeforeClass
    public static void setUp() throws Exception {
        EnvFactory.getEnv().initBeforeClass();
        initCreateSQLStatement();
        insertData();
    }

    @AfterClass
    public static void tearDown() throws Exception {
        close();
        EnvFactory.getEnv().cleanAfterClass();
    }

    private static void close() {
        if (Objects.nonNull(connection)) {
            try {
                connection.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    private static void initCreateSQLStatement() {
        sqls.add("CREATE DATABASE root.sg");
        sqls.add("CREATE TIMESERIES root.sg.d1.s1 WITH DATATYPE=BOOLEAN");
        sqls.add("CREATE TIMESERIES root.sg.d1.s2 WITH DATATYPE=FLOAT");
        sqls.add("CREATE TIMESERIES root.sg.d1.s3 WITH DATATYPE=INT32");
        sqls.add("CREATE ALIGNED TIMESERIES root.sg.d2(s1 BOOLEAN,s2 FLOAT,s3 INT32)");
    }

    private static void insertData() throws SQLException {
        connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement();

        for (String sql : sqls) {
            statement.execute(sql);
        }

        statement.close();
    }

    @Test
    public void testInsertNull() {
        String[] retArray =
                new String[]{
                        "1,null,1.0,1,", "2,true,null,2,", "3,true,3.0,null,",
                };

        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute("insert into root.sg.d1(time,s1,s2,s3) values(1,null,1.0,1)");
            statement.execute("insert into root.sg.d1(time,s1,s2,s3) values(2,true,null,2)");
            statement.execute("insert into root.sg.d1(time,s1,s2,s3) values(3,true,3.0,null)");

            try (ResultSet resultSet = statement.executeQuery("select * from root.sg.d1")) {
                assertNotNull(resultSet);
                ResultSetMetaData resultSetMetaData = resultSet.getMetaData();
                List<Integer> actualIndexToExpectedIndexList =
                        checkHeader(
                                resultSetMetaData,
                                "Time,root.sg.d1.s1,root.sg.d1.s2,root.sg.d1.s3",
                                new int[]{
                                        Types.TIMESTAMP, Types.BOOLEAN, Types.FLOAT, Types.INTEGER,
                                });

                int cnt = 0;
                while (resultSet.next()) {
                    String[] expectedStrings = retArray[cnt].split(",");
                    StringBuilder expectedBuilder = new StringBuilder();
                    StringBuilder actualBuilder = new StringBuilder();
                    for (int i = 1; i <= resultSetMetaData.getColumnCount(); i++) {
                        actualBuilder.append(resultSet.getString(i)).append(",");
                        expectedBuilder
                                .append(expectedStrings[actualIndexToExpectedIndexList.get(i - 1)])
                                .append(",");
                    }
                    assertEquals(expectedBuilder.toString(), actualBuilder.toString());
                    cnt++;
                }
                assertEquals(3, cnt);
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail(e.getMessage());
        }
    }

    @Test
    public void testInsertAlignedNull() {
        String[] retArray =
                new String[]{
                        "1,null,1.0,1,", "2,true,null,2,", "3,true,3.0,null,",
                };

        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute("insert into root.sg.d2(time,s1,s2,s3) aligned values(1,null,1.0,1)");
            statement.execute("insert into root.sg.d2(time,s1,s2,s3) aligned values(2,true,null,2)");
            statement.execute("insert into root.sg.d2(time,s1,s2,s3) aligned values(3,true,3.0,null)");

            try (ResultSet resultSet = statement.executeQuery("select * from root.sg.d2")) {
                assertNotNull(resultSet);
                ResultSetMetaData resultSetMetaData = resultSet.getMetaData();
                List<Integer> actualIndexToExpectedIndexList =
                        checkHeader(
                                resultSetMetaData,
                                "Time,root.sg.d2.s1,root.sg.d2.s2,root.sg.d2.s3",
                                new int[]{
                                        Types.TIMESTAMP, Types.BOOLEAN, Types.FLOAT, Types.INTEGER,
                                });

                int cnt = 0;
                while (resultSet.next()) {
                    String[] expectedStrings = retArray[cnt].split(",");
                    StringBuilder expectedBuilder = new StringBuilder();
                    StringBuilder actualBuilder = new StringBuilder();
                    for (int i = 1; i <= resultSetMetaData.getColumnCount(); i++) {
                        actualBuilder.append(resultSet.getString(i)).append(",");
                        expectedBuilder
                                .append(expectedStrings[actualIndexToExpectedIndexList.get(i - 1)])
                                .append(",");
                    }
                    assertEquals(expectedBuilder.toString(), actualBuilder.toString());
                    cnt++;
                }
                assertEquals(3, cnt);
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail(e.getMessage());
        }
    }

    private List<Integer> checkHeader(
            ResultSetMetaData resultSetMetaData, String expectedHeaderStrings, int[] expectedTypes)
            throws SQLException {
        String[] expectedHeaders = expectedHeaderStrings.split(",");
        Map<String, Integer> expectedHeaderToTypeIndexMap = new HashMap<>();
        for (int i = 0; i < expectedHeaders.length; ++i) {
            expectedHeaderToTypeIndexMap.put(expectedHeaders[i], i);
        }

        List<Integer> actualIndexToExpectedIndexList = new ArrayList<>();
        for (int i = 1; i <= resultSetMetaData.getColumnCount(); i++) {
            Integer typeIndex = expectedHeaderToTypeIndexMap.get(resultSetMetaData.getColumnName(i));
            assertNotNull(typeIndex);
            assertEquals(expectedTypes[typeIndex], resultSetMetaData.getColumnType(i));
            actualIndexToExpectedIndexList.add(typeIndex);
        }
        return actualIndexToExpectedIndexList;
    }
}
